WO2019207725A1 - Hot water storage-type hot water supply system - Google Patents

Hot water storage-type hot water supply system Download PDF

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Publication number
WO2019207725A1
WO2019207725A1 PCT/JP2018/017043 JP2018017043W WO2019207725A1 WO 2019207725 A1 WO2019207725 A1 WO 2019207725A1 JP 2018017043 W JP2018017043 W JP 2018017043W WO 2019207725 A1 WO2019207725 A1 WO 2019207725A1
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WO
WIPO (PCT)
Prior art keywords
hot water
water supply
water storage
heater
storage type
Prior art date
Application number
PCT/JP2018/017043
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French (fr)
Japanese (ja)
Inventor
謙介 松尾
直紀 柴崎
▲泰▼成 松村
修平 内藤
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2018/017043 priority Critical patent/WO2019207725A1/en
Priority to JP2020515401A priority patent/JPWO2019207725A1/en
Publication of WO2019207725A1 publication Critical patent/WO2019207725A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters

Definitions

  • This invention relates to a hot water storage type hot water supply system.
  • Patent Document 1 describes a hot water storage type water heater.
  • This hot water storage type hot water heater is a so-called indirect hot water supply type water heater that exchanges heat between hot water supplied from a hot water storage tank and hot water supplied from a water source.
  • the object is to provide a hot water storage hot water supply system that forms a hot water path from a water source to a hot water supply terminal with a plurality of hot water storage hot water heaters connected in series without impairing energy saving performance.
  • a hot water storage hot water system is a system that forms a hot water path from a water source to a hot water supply terminal with a plurality of hot water storage hot water heaters connected in series, and each hot water storage hot water heater is heated by a heat source.
  • a hot water storage tank for storing hot and cold water, a hot water supply heat exchanger for exchanging heat between hot water supplied from the hot water storage tank and hot water supplied from a water source, and a heat exchanger for supplying hot water from the water source
  • Hot water supply source that circulates hot water between a hot water supply pipe that leads hot water from the hot water supply heat exchanger to the hot water supply terminal, a hot water supply thermistor provided in the hot water supply pipe, and a hot water storage tank and a hot water heat exchanger
  • a controller for controlling the hot water supply heat source pump, the hot water supply pipe of the upstream hot water storage type hot water heater is connected to the water supply pipe of the downstream hot water storage type hot water heater, and the control part is operated during hot water supply operation. Detected by water supply thermistor And when the feed water temperature is equal to or higher than the temperature threshold value is intended to stop the operation of the hot water supply heat source pump.
  • a hot water path from a water source to a hot water supply terminal can be formed by a plurality of hot water storage type hot water heaters connected in series without impairing energy saving performance.
  • FIG. 1 is a configuration diagram of a hot water storage type water heater in Embodiment 1.
  • FIG. FIG. 3 is a configuration diagram showing a state during a hot water supply operation of the hot water storage type hot water heater in the first embodiment.
  • 1 is a configuration diagram of a hot water storage hot water supply system according to Embodiment 1.
  • FIG. 2 is a part of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment.
  • 3 is a remaining portion of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment.
  • FIG. 1 is a configuration diagram of a hot water storage type water heater in the first embodiment.
  • the hot water storage type water heater 10 includes a heat pump unit 1, a tank unit 2, and a remote controller 3.
  • the tank unit 2 contains piping and various parts.
  • the tank unit 2 is connected to the heat pump unit 1 via an HP outgoing pipe 12, an HP return pipe 13, and an electric wiring (not shown).
  • the tank unit 2 includes a control unit 50.
  • the control unit 50 is electrically connected to various valves, pumps, sensors, and the like included in the tank unit 2 and the heat pump unit 1.
  • the control unit 50 controls the operation of the hot water storage type hot water heater 10 based on the stored operation setting information.
  • the remote controller 3 is connected so that it can communicate with the control unit 50.
  • the remote control 3 is equipped with an operation unit and a display unit.
  • the user operates the remote controller 3 in order to perform settings necessary for the operation of the hot water storage type water heater 10.
  • the remote controller 3 receives, for example, an operation operation command input operation and a set value change operation for the hot water storage type hot water heater 10.
  • the remote controller 3 displays, for example, a set value and an operating state of the hot water storage type water heater 10.
  • the heat pump unit 1 functions as a heating means for heating the low temperature water led from the tank unit 2.
  • the heat pump unit 1 is a heat source that utilizes a heat pump cycle.
  • the heat pump cycle is formed by connecting a compressor, a water-refrigerant heat exchanger, an expansion valve, and an air heat exchanger in an annular shape with a refrigerant pipe.
  • the heat pump unit 1 generates high-temperature water by performing heat exchange between the refrigerant that has obtained thermal energy from the atmosphere and the low-temperature water led from the tank unit 2 using a water-refrigerant heat exchanger.
  • the tank unit 2 includes a hot water storage tank 11.
  • the hot water storage tank 11 is for storing thermal energy used in hot water supply.
  • water previously introduced from a water source or the like is stored as a heat medium.
  • a lower part of the hot water storage tank 11 is connected to the heat pump unit 1 via an HP outgoing pipe 12.
  • the upper part of the hot water storage tank 11 is connected to the heat pump unit 1 via the HP return pipe 13.
  • the HP outgoing pipe 12 and the HP return pipe 13 form an annular circulation circuit in which the heat medium moves between the heat pump unit 1 and the hot water storage tank 11.
  • a boiling circulation pump 14 is provided on the HP outgoing pipe 12.
  • the boiling circulation pump 14 When the boiling circulation pump 14 is operated, a boiling operation for storing hot water heated by the heat pump unit 1 in the hot water storage tank 11 is performed.
  • cold water is led from the lower part of the hot water storage tank 11 to the heat pump unit 1 via the HP outgoing pipe 12 and heated by the heat pump unit 1. It is returned as hot water to the upper part of the hot water storage tank 11 via.
  • hot water is gradually stored in the hot water storage tank 11 from the upper part to the lower part.
  • a hot water thermistor is provided on the surface of the can body of the hot water storage tank 11.
  • the remaining hot water thermistor for example, an upper remaining hot water thermistor 15, a lower remaining hot water thermistor 16, and a middle remaining hot water thermistor 17 are provided.
  • the upper remaining hot water thermistor 15 is provided in the upper part of the hot water storage tank 11.
  • the lower hot water thermistor 16 is provided at the lower part of the hot water storage tank 11.
  • One or more middle remaining hot water thermistors 17 are provided at a height between the upper remaining hot water thermistor 15 and the lower remaining hot water thermistor 16. Each remaining hot water thermistor detects the remaining hot water temperature at the respective attachment position with respect to the hot water storage tank 11.
  • the control unit 50 controls the start and stop of the boiling operation. For example, when the temperature detected by the upper remaining hot water thermistor 15 falls below a preset temperature, the control unit 50 starts the operation of the boiling circulation pump 14. For example, the control unit 50 starts the operation of the boiling circulation pump 14 when a preset time is reached. For example, when the temperature detected by the lower residual hot water thermistor 16 is equal to or higher than a preset temperature, the control unit 50 stops the operation of the boiling circulation pump 14. That is, when the control unit 50 determines that the hot water storage amount has reached the required amount, the boiling operation is stopped.
  • the remaining hot water temperature information detected by the middle remaining hot water thermistor 17 is used by the control unit 50 in order to calculate, for example, how much heat energy is stored in the hot water storage tank 11.
  • the tank unit 2 has a built-in heat exchanger 21 for hot water supply.
  • the primary inlet of the hot water supply heat exchanger 21 is connected to the upper part of the hot water storage tank 11 via the heat source introduction pipe 22.
  • a primary outlet of the hot water supply heat exchanger 21 is connected to the lower part of the hot water storage tank 11 via a heat source outlet pipe 23.
  • the heat source introduction pipe 22 and the heat source outlet pipe 23 form an annular circulation circuit that connects the hot water storage tank 11 and the hot water supply heat exchanger 21.
  • a hot water supply heat source pump 24 for circulating hot water in the circulation circuit is provided on the heat source outlet pipe 23, a hot water supply heat source pump 24 for circulating hot water in the circulation circuit is provided.
  • a water supply pipe 31 for guiding hot water supplied from a water source is connected to the secondary side inlet of the hot water supply heat exchanger 21.
  • a hot water supply pipe 34 for guiding hot water to the hot water supply terminal 4 is connected to the secondary side outlet of the hot water supply heat exchanger 21.
  • a hot water supply flow sensor 32 and a water supply thermistor 33 are provided on the water supply pipe 31.
  • a hot water supply thermistor 35 is provided on the hot water supply pipe 34.
  • the hot water supply flow sensor 32 detects the flow rate of hot water flowing through the water supply pipe 31.
  • the water supply thermistor 33 detects the temperature of the hot water flowing through the water supply pipe 31. That is, the water supply thermistor 33 detects the temperature of hot water flowing into the hot water supply heat exchanger 21.
  • the hot water supply thermistor 35 detects the temperature of the hot water flowing through the hot water supply pipe 34. That is, the hot water supply thermistor 35 detects the temperature of hot water flowing out from the hot water supply heat exchanger 21.
  • the temperature detected by the hot water supply thermistor 33 is referred to as “water supply temperature”
  • the temperature detected by the hot water supply thermistor 35 is referred to as “hot water temperature”.
  • FIG. 2 is a configuration diagram illustrating a state during a hot water supply operation of the hot water storage type water heater in the first embodiment.
  • the hot water supply operation is performed by operating the hot water supply heat source pump 24.
  • the hot water supply terminal 4 When the hot water supply terminal 4 is opened, hot water is supplied from the water source to the hot water supply terminal 4 through the water supply pipe 31, the hot water supply heat exchanger 21 and the hot water supply pipe 34.
  • the flow rate is detected by the hot water supply flow rate sensor 32, the operation of the hot water supply heat source pump 24 can be started by the control unit 50.
  • the hot water stored in the upper part of the hot water storage tank 11 is introduced to the primary side of the hot water supply heat exchanger 21 via the heat source introduction pipe 22.
  • the low-temperature hot water supplied from the water source is introduced to the secondary side of the hot water supply heat exchanger 21 via the water supply pipe 31.
  • the low temperature hot water introduced to the secondary side is heated by heat exchange with the high temperature hot water on the primary side in the hot water supply heat exchanger 21 and supplied to the hot water supply terminal 4 via the hot water supply pipe 34.
  • the primary hot water whose temperature has decreased due to heat exchange in the hot water supply heat exchanger 21 is returned to the lower part of the hot water storage tank 11 via the heat source outlet pipe 23.
  • the heat energy stored in the hot water storage tank 11 is indirectly transmitted to the low-temperature hot water supplied from the water source via the hot water supply heat exchanger 21 to perform hot water supply. This is called a method.
  • the control unit 50 controls the hot water supply temperature during the hot water supply operation.
  • a hot water supply temperature Tk of hot water heated by the hot water supply heat exchanger 21 is detected by a hot water supply thermistor 35.
  • Tkt preset by the user with the remote controller 3
  • Tkmin current hot water temperature
  • the hot water supply temperature Tk is adjusted by the control.
  • the controller 50 adjusts the hot water supply temperature by changing the rotation speed, which is the output of the hot water supply heat source pump 24.
  • the control unit 50 when changing the hot water supply temperature to a high temperature, the control unit 50 increases the number of revolutions of the hot water supply heat source pump 24 in order to increase the amount of high temperature water supplied from the hot water storage tank 11 to the hot water supply heat exchanger 21. For example, when changing the hot water supply temperature to a low temperature, the control unit 50 decreases the rotation speed of the hot water supply heat source pump 24 in order to reduce the amount of high temperature water supplied from the hot water storage tank 11 to the hot water supply heat exchanger 21.
  • the upper limit value Tkmmax and the lower limit value Tkmin of the target hot water supply temperature Tkt are automatically set by the control unit 50 when the user sets the target hot water supply temperature Tkt.
  • the range from the upper limit value Tkmax to the lower limit value Tkmin is usually set in a range of about ⁇ 2 [deg], for example, considering individual variations in the temperature detected by the hot water supply thermistor 35.
  • FIG. 3 is a configuration diagram of the hot water storage type hot water supply system according to the first embodiment.
  • the hot water storage type hot water supply system forms a hot water path from a water source to the hot water supply terminal 4 by a plurality of hot water storage type hot water heaters 10 in which a water supply pipe 31 and a hot water supply pipe 34 are connected in series.
  • the number of the hot water storage type hot water heaters 10 provided in the hot water storage type hot water supply system is not limited to three, and may be two or four or more.
  • integer number numbers are set in order from the upstream side near the water source.
  • the number of the hot water storage type hot water heater 10 located at the most upstream is set to “1”.
  • the number of the hot water storage hot water heater 10 located on the most downstream side is “N”.
  • the number of the hot water storage hot water heater 10 located downstream of the first unit and upstream of the Nth unit is “n”.
  • the first hot water supply pipe 34-1 of the first unit counted from the water source side is connected to the second water supply pipe 31-2 of the second unit (not shown) counted from the water source.
  • the hot water supply pipe 34-2 of Unit 2 is connected to the water supply pipe 31-3 of Unit 3 (not shown). Thereafter, the piping is similarly connected up to the No. N machine located on the most downstream side.
  • the hot water supply pipe 34 -N of No. N machine is connected to the hot water supply terminal 4.
  • various information is stored in the control units 50-1, 50-2,... 50-N of the respective hot water storage hot water heaters 10.
  • the various information includes, for example, the operating state of each unit, setting information including a unit number, priority unit information, and the like.
  • the setting information can include information input from the remote control 3 of each unit.
  • the priority unit information is information for identifying from which unit the hot water supply operation is preferentially performed at that time.
  • These control units 50 are connected to each other via a communication line, and can share each other's operation state and set values. These control units 50 can change the operating state of other units by communicating with each other.
  • These control parts 50 have a function which sets a priority to the plurality of hot water storage type hot water heaters 10 included in the hot water storage type hot water supply system.
  • the priority number machine is the hot water storage type water heater 10 having the highest priority at that time.
  • FIG. 4 is a part of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment.
  • the priority machine as the nth machine.
  • step S1 the control unit 50-n determines whether or not the detected temperature Tz of the upper remaining hot water thermistor 15-n of the current priority unit is equal to or higher than the remaining hot water determination temperature Tzo.
  • the remaining hot water determination temperature Tzo is a temperature threshold value for confirming whether the hot water stored in the upper portion of the hot water storage tank 11-n of the priority unit can secure the remaining hot water temperature sufficient for the hot water supply operation.
  • the hot water temperature supplied to the hot water supply terminal 4 is lower than the remaining hot water temperature. It is necessary to ensure a remaining hot water temperature higher than the hot water supply temperature Tkt.
  • step S2 is performed to change the priority number machine.
  • step S2 priorities are set for units other than the current priority unit in ascending order of the amount of heat energy stored in the hot water storage tank 11 of each unit.
  • step S3 the unit having the smallest stored heat energy amount is set as a new priority unit.
  • step S4 the boiling operation of the original priority number machine is permitted, and the newly set current priority number heating operation is prohibited. That is, in the current priority machine, since the boiling operation is not started until the hot water is used up, it is possible to effectively use the thermal energy stored in the hot water storage tank 11-n without waste.
  • step S5 is performed.
  • step S5 is performed next.
  • step S5 it is determined whether or not the hot water supply flow rate sensor 32-n of the current priority unit detects the flow rate.
  • step S9 the hot water supply operation is stopped by stopping the operation of the hot water supply heat source pump 24 of all the units.
  • step S10 a measured value Sk of a hot water supply start timer described later is reset to zero.
  • step S6 is performed next.
  • step S6 it is determined whether or not the detected temperature Tw1 of the water supply thermistor 33-n of the priority unit is lower than the first water supply temperature determination value Two1.
  • the detected temperature Tw1 of the feed water thermistor 33-n is the feed water temperature in the priority unit.
  • the first water supply temperature determination value Two1 is a temperature threshold value for determining whether or not to start the operation of the hot water supply heat source pump 24-n of the priority number machine.
  • First supply water temperature determination value Two1 may be set to a temperature that is equal to or lower than lower limit value Tkmin of target hot water supply temperature Tkt.
  • the first supply water temperature determination value Two1 may be changeable from the remote controller 3 according to the user's request.
  • step S6 when it is determined that Tw1 ⁇ Two1, the temperature of the hot water flowing into the priority unit from the upstream is high, so the hot water supply operation by the priority unit is unnecessary. In this case, step S9 is performed next.
  • step S6 when it is determined that Tw1 ⁇ Two1, the temperature of the hot water flowing into the priority unit from the upstream is low, so the hot water supply operation by the priority unit is necessary. In this case, step S7 is performed next.
  • step S7 operation of the hot water supply heat source pump 24-n of the priority unit is started.
  • step S8 counting by a hot water supply start timer described later is started. Following step S8, step S11 is performed.
  • step S11 it is determined whether or not the detected temperature Tk of the hot water supply thermistor 35-n of the priority unit satisfies Tkmin ⁇ Tk ⁇ Tkmax.
  • the detected temperature Tk of the hot water supply thermistor 35-n is the hot water supply temperature in the priority machine.
  • step S11 when the hot water supply temperature Tk does not satisfy Tkmin ⁇ Tk ⁇ Tkmax, it is necessary to adjust the hot water supply temperature.
  • step S12 is performed next.
  • the hot water supply temperature Tk is adjusted to fall within the range of Tkmin or more and Tkmax or less by changing the rotation speed of the hot water supply heat source pump 24-n by feedback control or the like.
  • step S13 is performed.
  • step S11 when the hot water supply temperature Tk satisfies Tkmin ⁇ Tk ⁇ Tkmax, it is not necessary to adjust the hot water supply temperature. In this case, the rotation speed of the hot water supply heat source pump 24-n is maintained, and step S13 is performed.
  • step S13 for each unit other than the priority unit, it is determined whether or not the unit is located downstream of the priority unit. This determination is performed based on the number of each hot water storage type hot water heater 10 stored in the control unit 50 in advance. If it is determined in step S13 that the relevant machine is located upstream of the priority machine, step S14 is performed. In step S14, the hot water supply operation of the relevant machine is stopped. In addition, when the hot water supply driving
  • step S15 it is determined whether or not the detected temperature Tw1 of the water supply thermistor 33 of the unit located downstream from the priority unit is lower than the second water supply temperature determination value Two2.
  • the detected temperature Tw1 of the feed water thermistor 33 is the feed water temperature in the relevant unit.
  • the second feed water temperature determination value Two2 is a temperature threshold value for determining whether or not to start the operation of the hot water supply heat source pump 24 of the number machine located downstream from the priority number machine.
  • the second water supply temperature determination value Two2 is larger than the first water supply temperature determination value Two1.
  • Second water supply temperature determination value Two2 may be set to a temperature located in a range between lower limit value Tkmin of target hot water supply temperature Tkt and first water supply temperature determination value Two1.
  • the second supply water temperature determination value Two2 may be changeable from the remote controller 3 according to the user's request.
  • step S15 When it is determined in step S15 that Tw1 ⁇ Two2, since a sufficient hot water supply temperature Tk can be secured by the hot water supply operation of the priority number machine, the hot water supply operation of the number machine located downstream from the priority number machine is unnecessary. In this case, step S17 is performed next. In step S17, the hot water supply operation of the relevant number machine located downstream of the priority number machine is stopped. In addition, when the hot water supply operation of the relevant machine is already stopped, the state is maintained in step S17.
  • step S15 If it is determined in step S15 that Tw1 ⁇ Two2, the hot water supply operation of the priority number machine does not ensure a sufficient hot water supply temperature Tk, and therefore the hot water supply operation of the number machine located downstream from the priority number machine is necessary. In this case, step S16 is performed next.
  • step S16 it is determined whether or not the measured value Sk of the hot water supply start timer that has started counting in step S8 is equal to or greater than the set value So.
  • the set value So of the hot water supply start timer is provided in order not to start the hot water supply operation of the number machine located downstream of the priority number machine until a predetermined time has elapsed since the start of the hot water supply operation of the priority number machine in step S7. For example, when a long time has passed since the previous hot water supply, the temperature of the hot water remaining in the hot water supply pipe 34 from the No. 1 machine located on the most upstream side to the hot water supply terminal 4 has decreased to a level close to the outside air temperature.
  • the set value So of the hot water supply start timer can be set in advance by the user from the remote controller 3 based on the length of the hot water supply pipe of the system and the instantaneous flow rate of hot water supply, for example. If the set value So of the hot water supply start timer is set by any one remote controller 3, it is shared by the control units 50 of all the cars.
  • Step S16 when it is determined that Sk ⁇ So, sufficient time has not elapsed since the start of the hot water supply operation of the priority unit. In this case, step S17 is performed next.
  • Step S16 when it is determined that Sk ⁇ So, a sufficient time has elapsed since the start of the hot water supply operation of the priority unit. In this case, step S18 is performed next.
  • step S18 it is determined whether or not the detected temperature Tk of the hot water supply thermistor 35 of each of the units located downstream of the priority unit satisfies Tkmin ⁇ Tk ⁇ Tkmax.
  • step S18 when the hot water supply temperature Tk in the unit located downstream from the priority unit satisfies Tkmin ⁇ Tk ⁇ Tkmax, it is not necessary to adjust the hot water supply temperature by the unit.
  • step S19 is performed next.
  • step S19 the state of the hot water supply operation of the relevant machine at that time is maintained.
  • step S18 when the hot water supply temperature Tk in the unit located downstream from the priority unit does not satisfy Tkmin ⁇ Tk ⁇ Tkmax, it is necessary to adjust the hot water supply temperature by the unit.
  • step S20 is performed next.
  • step S20 the operation of the hot water supply heat source pump 24 of the relevant unit is started.
  • step S21 is performed.
  • step S21 the hot water supply temperature Tk in the relevant machine is adjusted to fall within the range of Tkmin or more and Tkmax or less by changing the rotation speed of the hot water supply heat source pump 24 of the relevant equipment by feedback control or the like.
  • the hot water supply pipe 34 of the upstream hot water storage type hot water heater 10 among the two adjacent hot water storage type hot water heaters 10 is connected to the water supply pipe 31 of the downstream hot water storage type hot water heater 10.
  • the control unit 50 stops the operation of the hot water supply heat source pump 24 when the water supply temperature detected by the water supply thermistor 33 during the hot water supply operation is equal to or higher than the temperature threshold. For this reason, unnecessary hot water supply operation can be prevented.
  • a hot water path from the water source to the hot water supply terminal 4 can be formed by the plurality of hot water storage type hot water heaters 10 connected in series without impairing energy saving performance.
  • control part 50 with which each of the several hot water storage type hot water heater 10 is mutually connected with a communication line recognizes each other's operation state and setting value, and sets the priority order to the multiple hot water storage type hot water heaters 10.
  • the control unit 50 of the hot water storage type hot water heater 10 having the highest current priority is configured so that the hot water supply type hot water heater 10 has a hot water temperature detected by the water supply thermistor 33 of the hot water storage type hot water heater 10 that is below the temperature threshold.
  • the operation of the hot water supply heat source pump 24 is started. For this reason, when the temperature of the hot water flowing into the priority number machine from the upstream is low, the hot water supply operation of the priority number machine can be started.
  • control unit 50 of the hot water storage hot water heater 10 having the highest priority uses a value different from that of the other hot water storage hot water heaters 10 as a temperature threshold value to be compared with the water supply temperature detected by the water supply thermistor 33.
  • the first water supply temperature determination value Two1 and the second water supply temperature determination value Two2 are individually set. For this reason, even if hot water is not sufficiently heated in the hot water supply operation of the priority number machine, the lack of heating can be compensated by the hot water supply operation of the number machine located downstream from the priority number machine.
  • control unit 50 of the hot water storage hot water heater 10 positioned upstream of the hot water storage hot water heater 10 having the highest priority stops the hot water supply operation of the hot water storage hot water heater 10. For this reason, unnecessary hot water supply operation can be prevented.
  • control part 50 of the hot water storage type hot water heater 10 with the highest priority ranks the hot water storage type water heater 10 when the temperature of the hot water stored in the hot water storage tank 11 of the hot water storage type hot water heater 10 falls below the temperature threshold.
  • the hot water supply operation of the hot water storage type water heater 10 having the second highest priority is started. For this reason, when the remaining hot water temperature required for the hot water supply operation is insufficient in the current priority unit, the priority unit can be reset.
  • control unit 50 of the hot water storage hot water heater 10 located downstream of the hot water storage hot water heater 10 having the highest priority has a certain time after the hot water supply operation of the hot water storage hot water heater 10 having the highest priority is started.
  • the operation of the hot water supply heat source pump 24 is not started until the time has elapsed.
  • the hot water supply operation of the number machine located downstream from the priority number machine is not started until the measured value Sk of the hot water supply start timer becomes equal to or greater than the set value So. For this reason, it can prevent unnecessarily consuming the heat energy stored in the number machine located downstream from the priority number machine.
  • a certain period of time from the start of the hot water supply operation of the hot water storage type hot water heater 10 having the highest priority to the start of the operation of the hot water supply heat source pump 24 of the other hot water storage type hot water supply apparatus 10 depends on the user's request. Can be changed. For this reason, the set value So of the hot water supply start timer can be appropriately set according to the scale of the hot water storage type hot water supply system.
  • control unit 50 of the hot water storage hot water heater 10 having the highest priority stops the boiling operation until the hot water storage hot water heater 10 runs out of hot water. For this reason, the thermal energy stored in the current priority machine can be used without waste.
  • control unit 50 sets priorities for the plurality of hot water storage water heaters 10 so that the hot water storage water heaters 10 having a smaller amount of heat energy stored in the hot water storage tank 11 have higher priorities. For this reason, the thermal energy stored in each of the plurality of hot water storage type hot water heaters 10 is consumed in ascending order of the remaining amount. As a result, it is possible to suppress the occurrence of a bias in the boiling operation load among the plurality of hot water storage type hot water heaters 10.
  • the heat source of the hot water storage type water heater 10 may not be a heat pump.
  • the hot water storage type water heater 10 may be, for example, an electric heater provided in the hot water storage tank 11 as a heat source. Also in this case, it is possible to prevent the energy saving performance from being impaired in the hot water storage type hot water supply system.
  • the present invention can be used in a system for forming a hot water path from a water source to a hot water supply terminal by using a plurality of hot water storage hot water heaters connected in series without impairing energy saving performance.

Abstract

Provided is a hot water storage-type hot water supply system in which a passageway for hot water from a water source to a hot water supply terminal is formed by a plurality of hot water storage-type hot water suppliers which are connected in series, and in which energy-saving performance is not impaired. A hot water storage-type hot water supply system wherein: each hot water storage-type hot water supplier (10) comprises water supply piping (31) which guides hot water from a water source to a hot water supply heat exchanger (21), hot water supply piping (34) which guides the hot water from the hot water supply heat exchanger (21) to a hot water supply terminal, a water supply thermistor (33) provided to the water supply piping (31), and a hot water supply heat source pump (24) which circulates the hot water between a hot water storage tank (11) and the hot water supply heat exchanger (21); the hot water supply piping (34) of an upstream hot water storage-type hot water supplier (10) is connected to the water supply piping (31) of a downstream hot water storage-type hot water supplier (10); and a control unit (50) stops operation of the hot water supply heat source pump (24) if the water supply temperature detected by the water supply thermistor (33) during a hot water supply operation is at or above a temperature threshold value.

Description

貯湯式給湯システムHot water storage hot water supply system
　この発明は、貯湯式給湯システムに関する。 This invention relates to a hot water storage type hot water supply system.
　特許文献１には、貯湯式給湯機が記載されている。この貯湯式給湯機は、貯湯タンクから供給される湯水と水源から供給される湯水との間で熱交換を行わせる、いわゆる間接給湯方式の給湯機である。 Patent Document 1 describes a hot water storage type water heater. This hot water storage type hot water heater is a so-called indirect hot water supply type water heater that exchanges heat between hot water supplied from a hot water storage tank and hot water supplied from a water source.
日本特許第６１１９６７２号公報Japanese Patent No. 6119672
　１台の貯湯式給湯機で給湯の需要量を満たすことができない場合、複数台の貯湯式給湯機が連結された状態で使用され得る。しかしながら、特許文献１に記載された貯湯式給湯機を直列に複数台連結した場合、給湯端末を開くと、それぞれの給湯機で熱源循環運転が開始される。この場合、水源から供給される湯水が上流側の給湯機で十分に加温されていたとしても、下流側の給湯機の熱源循環運転が行われる。このため、放熱ロスが発生し、貯湯式給湯機の省エネ性が損なわれる。 When a single hot water storage type water heater cannot meet the demand for hot water supply, it can be used in a state where a plurality of hot water storage type water heaters are connected. However, when a plurality of hot water storage type hot water heaters described in Patent Document 1 are connected in series, when the hot water supply terminal is opened, the heat source circulation operation is started in each hot water heater. In this case, even if the hot water supplied from the water source is sufficiently heated by the upstream water heater, the heat source circulation operation of the downstream water heater is performed. For this reason, a heat dissipation loss occurs, and the energy saving performance of the hot water storage type hot water heater is impaired.
　この発明は、上記の課題を解決するためになされた。その目的は、省エネ性を損なうことなく、直列に連結された複数の貯湯式給湯機で水源から給湯端末へ至る湯水の経路を形成する貯湯式給湯システムを提供することである。 This invention has been made to solve the above-mentioned problems. The object is to provide a hot water storage hot water supply system that forms a hot water path from a water source to a hot water supply terminal with a plurality of hot water storage hot water heaters connected in series without impairing energy saving performance.
　この発明に係る貯湯式給湯システムは、直列に連結された複数の貯湯式給湯機で水源から給湯端末へ至る湯水の経路を形成するシステムであって、個々の貯湯式給湯機は、熱源によって加熱される湯水を貯留する貯湯タンクと、貯湯タンクから供給される湯水と水源から供給される湯水との間で熱交換を行わせる給湯用熱交換器と、水源からの湯水を給湯用熱交換器に導く給水配管と、給湯用熱交換器から給湯端末へ湯水を導く給湯配管と、給水配管に設けられた給水サーミスタと、貯湯タンクと給湯用熱交換器との間で湯水を循環させる給湯熱源ポンプと、給湯熱源ポンプを制御する制御部と、を備え、上流側の貯湯式給湯機の給湯配管は、下流側の貯湯式給湯機の給水配管に接続され、制御部は、給湯運転中に給水サーミスタで検出された給水温度が温度閾値以上である場合には、給湯熱源ポンプの運転を停止させるものである。 A hot water storage hot water system according to the present invention is a system that forms a hot water path from a water source to a hot water supply terminal with a plurality of hot water storage hot water heaters connected in series, and each hot water storage hot water heater is heated by a heat source. A hot water storage tank for storing hot and cold water, a hot water supply heat exchanger for exchanging heat between hot water supplied from the hot water storage tank and hot water supplied from a water source, and a heat exchanger for supplying hot water from the water source Hot water supply source that circulates hot water between a hot water supply pipe that leads hot water from the hot water supply heat exchanger to the hot water supply terminal, a hot water supply thermistor provided in the hot water supply pipe, and a hot water storage tank and a hot water heat exchanger And a controller for controlling the hot water supply heat source pump, the hot water supply pipe of the upstream hot water storage type hot water heater is connected to the water supply pipe of the downstream hot water storage type hot water heater, and the control part is operated during hot water supply operation. Detected by water supply thermistor And when the feed water temperature is equal to or higher than the temperature threshold value is intended to stop the operation of the hot water supply heat source pump.
　この発明によれば、省エネ性を損なうことなく、直列に連結された複数の貯湯式給湯機で水源から給湯端末へ至る湯水の経路を形成することができる。 According to the present invention, a hot water path from a water source to a hot water supply terminal can be formed by a plurality of hot water storage type hot water heaters connected in series without impairing energy saving performance.
実施の形態１における貯湯式給湯機の構成図である。1 is a configuration diagram of a hot water storage type water heater in Embodiment 1. FIG. 実施の形態１における貯湯式給湯機の給湯運転時の状態を示す構成図である。FIG. 3 is a configuration diagram showing a state during a hot water supply operation of the hot water storage type hot water heater in the first embodiment. 実施の形態１における貯湯式給湯システムの構成図である。1 is a configuration diagram of a hot water storage hot water supply system according to Embodiment 1. FIG. 実施の形態１における貯湯式給湯システムによる給湯制御を示すフローチャートの一部である。2 is a part of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment. 実施の形態１における貯湯式給湯システムによる給湯制御を示すフローチャートの残部である。3 is a remaining portion of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment.
　以下、添付の図面を参照して実施の形態について説明する。各図において、同一または相当する部分には同一の符号が付される。重複する説明は、適宜簡略化あるいは省略する。 Hereinafter, embodiments will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. The overlapping description will be simplified or omitted as appropriate.
実施の形態１．
　図１は、実施の形態１における貯湯式給湯機の構成図である。貯湯式給湯機１０は、ヒートポンプユニット１、タンクユニット２およびリモコン３を備える。タンクユニット２には、配管および各種部品が内蔵される。タンクユニット２は、ＨＰ往き配管１２、ＨＰ戻り配管１３および図示しない電気配線を介してヒートポンプユニット１と接続される。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type water heater in the first embodiment. The hot water storage type water heater 10 includes a heat pump unit 1, a tank unit 2, and a remote controller 3. The tank unit 2 contains piping and various parts. The tank unit 2 is connected to the heat pump unit 1 via an HP outgoing pipe 12, an HP return pipe 13, and an electric wiring (not shown).
　タンクユニット２には、制御部５０が内蔵される。制御部５０は、タンクユニット２およびヒートポンプユニット１が備える各種弁類、ポンプ類、センサ類等と電気的に接続される。制御部５０は、保存された運転設定情報などに基づいて貯湯式給湯機１０の運転制御を行う。 The tank unit 2 includes a control unit 50. The control unit 50 is electrically connected to various valves, pumps, sensors, and the like included in the tank unit 2 and the heat pump unit 1. The control unit 50 controls the operation of the hot water storage type hot water heater 10 based on the stored operation setting information.
　リモコン３は、制御部５０と相互通信し得るように接続される。リモコン３には、操作部および表示部が搭載される。使用者は、例えば、貯湯式給湯機１０の運転に必要な設定を行うためにリモコン３を操作する。リモコン３は、例えば、貯湯式給湯機１０に対する運転動作指令の入力操作および設定値の変更操作等を受け付ける。リモコン３は、例えば、貯湯式給湯機１０の設定値および運転状態等を表示する。 The remote controller 3 is connected so that it can communicate with the control unit 50. The remote control 3 is equipped with an operation unit and a display unit. For example, the user operates the remote controller 3 in order to perform settings necessary for the operation of the hot water storage type water heater 10. The remote controller 3 receives, for example, an operation operation command input operation and a set value change operation for the hot water storage type hot water heater 10. The remote controller 3 displays, for example, a set value and an operating state of the hot water storage type water heater 10.
　ヒートポンプユニット１は、タンクユニット２から導かれた低温水を加熱するための加熱手段として機能する。ヒートポンプユニット１は、ヒートポンプサイクルを利用する熱源である。ヒートポンプサイクルは、圧縮機、水冷媒熱交換器、膨張弁、空気熱交換器を冷媒配管にて環状に接続することで形成される。ヒートポンプユニット１は、大気中から熱エネルギーを得た冷媒とタンクユニット２から導かれた低温水との間での熱交換を水冷媒熱交換器で行うことにより、高温水を生成する。 The heat pump unit 1 functions as a heating means for heating the low temperature water led from the tank unit 2. The heat pump unit 1 is a heat source that utilizes a heat pump cycle. The heat pump cycle is formed by connecting a compressor, a water-refrigerant heat exchanger, an expansion valve, and an air heat exchanger in an annular shape with a refrigerant pipe. The heat pump unit 1 generates high-temperature water by performing heat exchange between the refrigerant that has obtained thermal energy from the atmosphere and the low-temperature water led from the tank unit 2 using a water-refrigerant heat exchanger.
　タンクユニット２は、貯湯タンク１１を備える。貯湯タンク１１は、給湯で使用される熱エネルギーを蓄えるためのものである。貯湯タンク１１には、例えば、予め水源等から導いた水が熱媒として貯留される。貯湯タンク１１の下部は、ＨＰ往き配管１２を介してヒートポンプユニット１に接続される。貯湯タンク１１の上部は、ＨＰ戻り配管１３を介してヒートポンプユニット１に接続される。ＨＰ往き配管１２およびＨＰ戻り配管１３は、ヒートポンプユニット１と貯湯タンク１１との間を熱媒が移動する環状の循環回路を形成する。 The tank unit 2 includes a hot water storage tank 11. The hot water storage tank 11 is for storing thermal energy used in hot water supply. In the hot water storage tank 11, for example, water previously introduced from a water source or the like is stored as a heat medium. A lower part of the hot water storage tank 11 is connected to the heat pump unit 1 via an HP outgoing pipe 12. The upper part of the hot water storage tank 11 is connected to the heat pump unit 1 via the HP return pipe 13. The HP outgoing pipe 12 and the HP return pipe 13 form an annular circulation circuit in which the heat medium moves between the heat pump unit 1 and the hot water storage tank 11.
　ＨＰ往き配管１２上には、沸上循環ポンプ１４が設けられる。沸上循環ポンプ１４が運転されることで、ヒートポンプユニット１で加熱された湯を貯湯タンク１１の内部に貯留する沸き上げ運転が行われる。沸上循環ポンプ１４の運転が開始されると、冷水が貯湯タンク１１の下部からＨＰ往き配管１２を経由してヒートポンプユニット１に導かれ、ヒートポンプユニット１で加熱された後、ＨＰ戻り配管１３を経由して貯湯タンク１１の上部に熱水として戻される。沸き上げ運転により、貯湯タンク１１内には、上部から下部に向けて高温の湯が徐々に貯留される。 A boiling circulation pump 14 is provided on the HP outgoing pipe 12. When the boiling circulation pump 14 is operated, a boiling operation for storing hot water heated by the heat pump unit 1 in the hot water storage tank 11 is performed. When the operation of the boiling circulation pump 14 is started, cold water is led from the lower part of the hot water storage tank 11 to the heat pump unit 1 via the HP outgoing pipe 12 and heated by the heat pump unit 1. It is returned as hot water to the upper part of the hot water storage tank 11 via. By the boiling operation, hot water is gradually stored in the hot water storage tank 11 from the upper part to the lower part.
　貯湯タンク１１の缶体表面には、残湯サーミスタが設けられる。残湯サーミスタとしては、例えば、上部残湯サーミスタ１５、下部残湯サーミスタ１６および中部残湯サーミスタ１７が設けられる。上部残湯サーミスタ１５は、貯湯タンク１１の上部に設けられる。下部残湯サーミスタ１６は、貯湯タンク１１の下部に設けられる。中部残湯サーミスタ１７は、上部残湯サーミスタ１５と下部残湯サーミスタ１６との間の高さに１つまたは複数設けられる。各残湯サーミスタは、貯湯タンク１１に対するそれぞれの取り付け位置の残湯温度を検出する。 A hot water thermistor is provided on the surface of the can body of the hot water storage tank 11. As the remaining hot water thermistor, for example, an upper remaining hot water thermistor 15, a lower remaining hot water thermistor 16, and a middle remaining hot water thermistor 17 are provided. The upper remaining hot water thermistor 15 is provided in the upper part of the hot water storage tank 11. The lower hot water thermistor 16 is provided at the lower part of the hot water storage tank 11. One or more middle remaining hot water thermistors 17 are provided at a height between the upper remaining hot water thermistor 15 and the lower remaining hot water thermistor 16. Each remaining hot water thermistor detects the remaining hot water temperature at the respective attachment position with respect to the hot water storage tank 11.
　制御部５０は、沸き上げ運転の開始および停止を制御する。制御部５０は、例えば、上部残湯サーミスタ１５で検出された温度が予め設定された温度を下回った場合に、沸上循環ポンプ１４の運転を開始させる。制御部５０は、例えば、予め設定された時刻になった場合に、沸上循環ポンプ１４の運転を開始させる。制御部５０は、例えば、下部残湯サーミスタ１６で検出された温度が予め設定された温度以上となった場合に、沸上循環ポンプ１４の運転を停止させる。つまり、貯湯量が必要量に達したと制御部５０によって判定された場合、沸き上げ運転が停止される。なお、中部残湯サーミスタ１７で検出された残湯温度情報は、例えば、貯湯タンク１１内にどの程度の熱エネルギーが貯留されているか等を演算するために、制御部５０によって使用される。 The control unit 50 controls the start and stop of the boiling operation. For example, when the temperature detected by the upper remaining hot water thermistor 15 falls below a preset temperature, the control unit 50 starts the operation of the boiling circulation pump 14. For example, the control unit 50 starts the operation of the boiling circulation pump 14 when a preset time is reached. For example, when the temperature detected by the lower residual hot water thermistor 16 is equal to or higher than a preset temperature, the control unit 50 stops the operation of the boiling circulation pump 14. That is, when the control unit 50 determines that the hot water storage amount has reached the required amount, the boiling operation is stopped. The remaining hot water temperature information detected by the middle remaining hot water thermistor 17 is used by the control unit 50 in order to calculate, for example, how much heat energy is stored in the hot water storage tank 11.
　タンクユニット２には、給湯用熱交換器２１が内蔵される。給湯用熱交換器２１の一次側入口は、熱源導入配管２２を介して貯湯タンク１１の上部に接続される。給湯用熱交換器２１の一次側出口は、熱源導出配管２３を介して貯湯タンク１１の下部に接続される。熱源導入配管２２および熱源導出配管２３は、貯湯タンク１１と給湯用熱交換器２１を結ぶ環状の循環回路を形成する。熱源導出配管２３上には、この循環回路に湯水を循環させるための給湯熱源ポンプ２４が設けられる。 The tank unit 2 has a built-in heat exchanger 21 for hot water supply. The primary inlet of the hot water supply heat exchanger 21 is connected to the upper part of the hot water storage tank 11 via the heat source introduction pipe 22. A primary outlet of the hot water supply heat exchanger 21 is connected to the lower part of the hot water storage tank 11 via a heat source outlet pipe 23. The heat source introduction pipe 22 and the heat source outlet pipe 23 form an annular circulation circuit that connects the hot water storage tank 11 and the hot water supply heat exchanger 21. On the heat source outlet pipe 23, a hot water supply heat source pump 24 for circulating hot water in the circulation circuit is provided.
　給湯用熱交換器２１の二次側入口には、水源から供給される湯水を導くための給水配管３１が接続される。給湯用熱交換器２１の二次側出口には、湯水を給湯端末４に導くための給湯配管３４が接続される。給水配管３１上には、給湯流量センサ３２および給水サーミスタ３３が設けられる。給湯配管３４上には、給湯サーミスタ３５が設けられる。 A water supply pipe 31 for guiding hot water supplied from a water source is connected to the secondary side inlet of the hot water supply heat exchanger 21. A hot water supply pipe 34 for guiding hot water to the hot water supply terminal 4 is connected to the secondary side outlet of the hot water supply heat exchanger 21. A hot water supply flow sensor 32 and a water supply thermistor 33 are provided on the water supply pipe 31. A hot water supply thermistor 35 is provided on the hot water supply pipe 34.
　給湯流量センサ３２は、給水配管３１を流れる湯水の流量を検出する。給水サーミスタ３３は、給水配管３１を流れる湯水の温度を検出する。つまり、給水サーミスタ３３は、給湯用熱交換器２１に流入する湯水の温度を検出する。給湯サーミスタ３５は、給湯配管３４を流れる湯水の温度を検出する。つまり、給湯サーミスタ３５は、給湯用熱交換器２１から流出する湯水の温度を検出する。以下、給水サーミスタ３３で検出される温度を「給水温度」と称し、給湯サーミスタ３５で検出される温度を「給湯温度」と称する。 The hot water supply flow sensor 32 detects the flow rate of hot water flowing through the water supply pipe 31. The water supply thermistor 33 detects the temperature of the hot water flowing through the water supply pipe 31. That is, the water supply thermistor 33 detects the temperature of hot water flowing into the hot water supply heat exchanger 21. The hot water supply thermistor 35 detects the temperature of the hot water flowing through the hot water supply pipe 34. That is, the hot water supply thermistor 35 detects the temperature of hot water flowing out from the hot water supply heat exchanger 21. Hereinafter, the temperature detected by the hot water supply thermistor 33 is referred to as “water supply temperature”, and the temperature detected by the hot water supply thermistor 35 is referred to as “hot water temperature”.
　図２は、実施の形態１における貯湯式給湯機の給湯運転時の状態を示す構成図である。給湯運転は、給湯熱源ポンプ２４が運転されることで行われる。給湯端末４が開かれると、水源から給水配管３１、給湯用熱交換器２１および給湯配管３４を介して給湯端末４に湯水が供給される。給湯流量センサ３２で流量が検出されると、制御部５０によって給湯熱源ポンプ２４の運転が開始され得る。 FIG. 2 is a configuration diagram illustrating a state during a hot water supply operation of the hot water storage type water heater in the first embodiment. The hot water supply operation is performed by operating the hot water supply heat source pump 24. When the hot water supply terminal 4 is opened, hot water is supplied from the water source to the hot water supply terminal 4 through the water supply pipe 31, the hot water supply heat exchanger 21 and the hot water supply pipe 34. When the flow rate is detected by the hot water supply flow rate sensor 32, the operation of the hot water supply heat source pump 24 can be started by the control unit 50.
　給湯熱源ポンプ２４の運転が開始されると、貯湯タンク１１の上部に貯留されている高温の湯は、熱源導入配管２２を経由して給湯用熱交換器２１の一次側に導入される。水源から供給された低温の湯水は、給水配管３１を経由して給湯用熱交換器２１の二次側に導入される。二次側に導入された低温の湯水は、給湯用熱交換器２１において一次側の高温の湯との熱交換によって加熱され、給湯配管３４を経由して給湯端末４へ供給される。給湯用熱交換器２１で熱交換されて温度が低下した一次側の湯は、熱源導出配管２３を介して貯湯タンク１１の下部に戻される。このような給湯方式は、給湯用熱交換器２１を介して、貯湯タンク１１に貯留された熱エネルギーを水源から導かれた低温の給湯水に間接的に伝えて給湯を行うことから、間接給湯方式と称する。 When the operation of the hot water supply heat source pump 24 is started, the hot water stored in the upper part of the hot water storage tank 11 is introduced to the primary side of the hot water supply heat exchanger 21 via the heat source introduction pipe 22. The low-temperature hot water supplied from the water source is introduced to the secondary side of the hot water supply heat exchanger 21 via the water supply pipe 31. The low temperature hot water introduced to the secondary side is heated by heat exchange with the high temperature hot water on the primary side in the hot water supply heat exchanger 21 and supplied to the hot water supply terminal 4 via the hot water supply pipe 34. The primary hot water whose temperature has decreased due to heat exchange in the hot water supply heat exchanger 21 is returned to the lower part of the hot water storage tank 11 via the heat source outlet pipe 23. In such a hot water supply system, the heat energy stored in the hot water storage tank 11 is indirectly transmitted to the low-temperature hot water supplied from the water source via the hot water supply heat exchanger 21 to perform hot water supply. This is called a method.
　制御部５０は、給湯運転時に給湯温度の制御を行う。給湯用熱交換器２１で加熱された給湯水の給湯温度Ｔｋは、給湯サーミスタ３５で検出される。使用者が予めリモコン３で設定した目標給湯温度Ｔｋｔと現在の給湯温度Ｔｋとの間に差がある場合、上限値Ｔｋｍａｘと下限値Ｔｋｍｉｎとの間の範囲に給湯温度Ｔｋが入るように、フィードバック制御により給湯温度Ｔｋが調整される。制御部５０は、給湯熱源ポンプ２４の出力である回転数を変更させることで、給湯温度を調整する。例えば、給湯温度を高温に変化させる場合、制御部５０は、貯湯タンク１１から給湯用熱交換器２１に供給される高温水の量を増やすために給湯熱源ポンプ２４の回転数を増加させる。例えば、給湯温度を低温に変化させる場合、制御部５０は、貯湯タンク１１から給湯用熱交換器２１に供給される高温水の量を減らすために給湯熱源ポンプ２４の回転数を減少させる。 The control unit 50 controls the hot water supply temperature during the hot water supply operation. A hot water supply temperature Tk of hot water heated by the hot water supply heat exchanger 21 is detected by a hot water supply thermistor 35. When there is a difference between the target hot water temperature Tkt preset by the user with the remote controller 3 and the current hot water temperature Tk, feedback is performed so that the hot water temperature Tk falls within the range between the upper limit value Tkmax and the lower limit value Tkmin. The hot water supply temperature Tk is adjusted by the control. The controller 50 adjusts the hot water supply temperature by changing the rotation speed, which is the output of the hot water supply heat source pump 24. For example, when changing the hot water supply temperature to a high temperature, the control unit 50 increases the number of revolutions of the hot water supply heat source pump 24 in order to increase the amount of high temperature water supplied from the hot water storage tank 11 to the hot water supply heat exchanger 21. For example, when changing the hot water supply temperature to a low temperature, the control unit 50 decreases the rotation speed of the hot water supply heat source pump 24 in order to reduce the amount of high temperature water supplied from the hot water storage tank 11 to the hot water supply heat exchanger 21.
　なお、目標給湯温度Ｔｋｔの上限値Ｔｋｍａｘおよび下限値Ｔｋｍｉｎは、使用者が目標給湯温度Ｔｋｔを設定すれば、制御部５０によって自動的に設定される。上限値Ｔｋｍａｘから下限値Ｔｋｍｉｎまでの範囲は、例えば、給湯サーミスタ３５の検出温度の個体バラつき等を考慮すると、通常±２［ｄｅｇ］程度の範囲で設定される。 The upper limit value Tkmmax and the lower limit value Tkmin of the target hot water supply temperature Tkt are automatically set by the control unit 50 when the user sets the target hot water supply temperature Tkt. The range from the upper limit value Tkmax to the lower limit value Tkmin is usually set in a range of about ± 2 [deg], for example, considering individual variations in the temperature detected by the hot water supply thermistor 35.
　図３は、実施の形態１における貯湯式給湯システムの構成図である。貯湯式給湯システムは、給水配管３１および給湯配管３４が直列に連結された複数の貯湯式給湯機１０で水源から給湯端末４へ至る湯水の経路を形成する。なお、貯湯式給湯システムが備える貯湯式給湯機１０の台数は、３台に限らず、２台または４台以上であってもよい。 FIG. 3 is a configuration diagram of the hot water storage type hot water supply system according to the first embodiment. The hot water storage type hot water supply system forms a hot water path from a water source to the hot water supply terminal 4 by a plurality of hot water storage type hot water heaters 10 in which a water supply pipe 31 and a hot water supply pipe 34 are connected in series. In addition, the number of the hot water storage type hot water heaters 10 provided in the hot water storage type hot water supply system is not limited to three, and may be two or four or more.
　図３に示す貯湯式給湯機１０には、水源に近い上流側から順に、整数の号機番号が設定される。最上流に位置する貯湯式給湯機１０の号機番号を「１」とする。最下流に位置する貯湯式給湯機１０の号機番号を「Ｎ」とする。１号機よりも下流かつＮ号機よりも上流に位置する貯湯式給湯機１０の号機番号を「ｎ」とする。これらの連結された貯湯式給湯機１０は、同じ部品を搭載している。以下の説明では、複数の貯湯式給湯機１０を区別する場合、部品の符号に号機番号を付加して表す。 In the hot water storage type water heater 10 shown in FIG. 3, integer number numbers are set in order from the upstream side near the water source. The number of the hot water storage type hot water heater 10 located at the most upstream is set to “1”. The number of the hot water storage hot water heater 10 located on the most downstream side is “N”. The number of the hot water storage hot water heater 10 located downstream of the first unit and upstream of the Nth unit is “n”. These connected hot water storage type water heaters 10 are equipped with the same components. In the following description, when a plurality of hot water storage type hot water heaters 10 are distinguished, a machine number is added to the reference numerals of the parts.
　貯湯式給湯システムにおいて、水源側から数えて１台目である１号機の給湯配管３４－１は、水源から数えて２台目である図示しない２号機の給水配管３１－２に接続される。２号機の給湯配管３４－２は、図示しない３号機の給水配管３１－３に接続される。以下、最下流に位置するＮ号機まで同様に配管の接続が為される。Ｎ号機の給湯配管３４－Ｎは、給湯端末４に接続される。 In the hot water storage hot water supply system, the first hot water supply pipe 34-1 of the first unit counted from the water source side is connected to the second water supply pipe 31-2 of the second unit (not shown) counted from the water source. The hot water supply pipe 34-2 of Unit 2 is connected to the water supply pipe 31-3 of Unit 3 (not shown). Thereafter, the piping is similarly connected up to the No. N machine located on the most downstream side. The hot water supply pipe 34 -N of No. N machine is connected to the hot water supply terminal 4.
　貯湯式給湯システムにおいて、それぞれの貯湯式給湯機１０の制御部５０－１、５０－２・・・５０－Ｎには、各種情報が保存されている。各種情報には、例えば、各号機の運転状態、号機番号を含む設定情報、および優先号機情報等が含まれる。設定情報には、それぞれの号機のリモコン３から入力された情報が含まれ得る。優先号機情報は、その時点でどの号機から優先的に給湯運転を行うかを識別するための情報である。これらの制御部５０は、相互に通信線で接続されており、相互の運転状態および設定値等を共有することが可能である。これらの制御部５０は、相互に通信することで、他の号機の運転状態を変化させることが可能である。これらの制御部５０は、貯湯式給湯システムに含まれる複数の貯湯式給湯機１０に優先順位を設定する機能を有する。優先号機は、その時点で優先順位が最も高い貯湯式給湯機１０である。 In the hot water storage hot water supply system, various information is stored in the control units 50-1, 50-2,... 50-N of the respective hot water storage hot water heaters 10. The various information includes, for example, the operating state of each unit, setting information including a unit number, priority unit information, and the like. The setting information can include information input from the remote control 3 of each unit. The priority unit information is information for identifying from which unit the hot water supply operation is preferentially performed at that time. These control units 50 are connected to each other via a communication line, and can share each other's operation state and set values. These control units 50 can change the operating state of other units by communicating with each other. These control parts 50 have a function which sets a priority to the plurality of hot water storage type hot water heaters 10 included in the hot water storage type hot water supply system. The priority number machine is the hot water storage type water heater 10 having the highest priority at that time.
　図４は、実施の形態１における貯湯式給湯システムによる給湯制御を示すフローチャートの一部である。図５は、実施の形態１における貯湯式給湯システムによる給湯制御を示すフローチャートの残部である。図４および図５は、合わせて１つのフローチャートである。以下、優先号機をｎ号機として、給湯運転時における貯湯式給湯システムの動作例を説明する。 FIG. 4 is a part of a flowchart showing hot water supply control by the hot water storage type hot water supply system in the first embodiment. FIG. 5 is the remaining part of the flowchart showing the hot water supply control by the hot water storage type hot water supply system in the first embodiment. 4 and 5 are a flowchart in total. Hereinafter, an example of the operation of the hot water storage type hot water supply system during the hot water supply operation will be described with the priority machine as the nth machine.
　ステップＳ１では、制御部５０－ｎによって、現在の優先号機の上部残湯サーミスタ１５－ｎの検出温度Ｔｚが残湯判定温度Ｔｚｏ以上であるか否かの判定が行われる。残湯判定温度Ｔｚｏは、優先号機の貯湯タンク１１－ｎ上部に貯留された湯が給湯運転に足る残湯温度を確保できているかを確認するための温度閾値である。一般的に給湯用熱交換器２１による熱交換の際には伝熱ロス等が生じるため、給湯端末４に供給される湯温は残湯温度よりも低くなることから、使用者が設定する目標給湯温度Ｔｋｔよりも高い残湯温度を確保する必要がある。 In step S1, the control unit 50-n determines whether or not the detected temperature Tz of the upper remaining hot water thermistor 15-n of the current priority unit is equal to or higher than the remaining hot water determination temperature Tzo. The remaining hot water determination temperature Tzo is a temperature threshold value for confirming whether the hot water stored in the upper portion of the hot water storage tank 11-n of the priority unit can secure the remaining hot water temperature sufficient for the hot water supply operation. Generally, since heat loss or the like occurs during heat exchange by the hot water supply heat exchanger 21, the hot water temperature supplied to the hot water supply terminal 4 is lower than the remaining hot water temperature. It is necessary to ensure a remaining hot water temperature higher than the hot water supply temperature Tkt.
　ステップＳ１において、Ｔｚ＜Ｔｚｏと判定された場合、現在の優先号機では給湯運転を行うために必要となる残湯温度が不足している。この場合、優先号機を変更するために、ステップＳ２が実施される。 When it is determined in step S1 that Tz <Tzo, the current priority machine has insufficient remaining hot water temperature necessary for hot water supply operation. In this case, step S2 is performed to change the priority number machine.
　ステップＳ２では、現在の優先号機以外の号機に対し、それぞれの号機の貯湯タンク１１に貯留されている熱エネルギー量が小さい順に優先順位が設定される。ステップＳ３では、最も貯留熱エネルギー量が小さい号機が新たな優先号機として設定される。ステップＳ４では、元の優先号機の沸き上げ運転が許可されると共に、新たに設定された現在の優先号機の沸き上げ運転が禁止される。つまり、現在の優先号機では湯を使い切るまで沸き上げ運転が開始されないため、貯湯タンク１１－ｎ内に貯留された熱エネルギーを無駄なく有効に使用することが可能となる。ステップＳ４の次は、ステップＳ５が実施される。 In step S2, priorities are set for units other than the current priority unit in ascending order of the amount of heat energy stored in the hot water storage tank 11 of each unit. In step S3, the unit having the smallest stored heat energy amount is set as a new priority unit. In step S4, the boiling operation of the original priority number machine is permitted, and the newly set current priority number heating operation is prohibited. That is, in the current priority machine, since the boiling operation is not started until the hot water is used up, it is possible to effectively use the thermal energy stored in the hot water storage tank 11-n without waste. Following step S4, step S5 is performed.
　ステップＳ１において、Ｔｚ≧Ｔｚｏと判定された場合、現在の優先号機では給湯運転を行う上で十分な残湯温度が確保されている。この場合、次にステップＳ５が実施される。 When it is determined in step S1 that Tz ≧ Tzo, the current priority unit has a sufficient remaining hot water temperature for performing the hot water supply operation. In this case, step S5 is performed next.
　ステップＳ５では、現在の優先号機の給湯流量センサ３２－ｎが流量を検出しているか否かの判定が行われる。給湯流量センサ３２－ｎが流量を検出していない場合、給湯の必要は無いと判定される。この場合、次にステップＳ９が実施される。ステップＳ９では、全号機の給湯熱源ポンプ２４の運転を停止することで、給湯運転が停止される。その後、ステップＳ１０において、後述する給湯開始タイマーの計測値Ｓｋがゼロにリセットされる。一方、給湯流量センサ３２－ｎが流量を検出している場合、給湯中であると判定される。この場合、次にステップＳ６が実施される。 In step S5, it is determined whether or not the hot water supply flow rate sensor 32-n of the current priority unit detects the flow rate. When the hot water supply flow sensor 32-n does not detect the flow rate, it is determined that there is no need for hot water supply. In this case, step S9 is performed next. In step S9, the hot water supply operation is stopped by stopping the operation of the hot water supply heat source pump 24 of all the units. Thereafter, in step S10, a measured value Sk of a hot water supply start timer described later is reset to zero. On the other hand, when the hot water supply flow sensor 32-n detects the flow rate, it is determined that hot water is being supplied. In this case, step S6 is performed next.
　ステップＳ６では、優先号機の給水サーミスタ３３－ｎの検出温度Ｔｗ１が第１の給水温度判定値Ｔｗｏ１よりも低いか否かの判定が行われる。給水サーミスタ３３－ｎの検出温度Ｔｗ１は、優先号機における給水温度である。第１の給水温度判定値Ｔｗｏ１は、優先号機の給湯熱源ポンプ２４－ｎの運転を開始させるか否かを判定するための温度閾値である。第１の給水温度判定値Ｔｗｏ１は、目標給湯温度Ｔｋｔの下限値Ｔｋｍｉｎと同等の温度または下限値Ｔｋｍｉｎよりもやや小さい温度に設定されればよい。第１の給水温度判定値Ｔｗｏ１は、例えば、使用者の求めに応じてリモコン３から設置値を変更可能であってもよい。 In step S6, it is determined whether or not the detected temperature Tw1 of the water supply thermistor 33-n of the priority unit is lower than the first water supply temperature determination value Two1. The detected temperature Tw1 of the feed water thermistor 33-n is the feed water temperature in the priority unit. The first water supply temperature determination value Two1 is a temperature threshold value for determining whether or not to start the operation of the hot water supply heat source pump 24-n of the priority number machine. First supply water temperature determination value Two1 may be set to a temperature that is equal to or lower than lower limit value Tkmin of target hot water supply temperature Tkt. For example, the first supply water temperature determination value Two1 may be changeable from the remote controller 3 according to the user's request.
　ステップＳ６において、Ｔｗ１≧Ｔｗｏ１と判定された場合、上流から優先号機に流入する湯水の温度が高いため、優先号機による給湯運転は不要である。この場合、次にステップＳ９が実施される。 In step S6, when it is determined that Tw1 ≧ Two1, the temperature of the hot water flowing into the priority unit from the upstream is high, so the hot water supply operation by the priority unit is unnecessary. In this case, step S9 is performed next.
　ステップＳ６において、Ｔｗ１＜Ｔｗｏ１と判定された場合、上流から優先号機に流入する湯水の温度が低いため、優先号機による給湯運転が必要である。この場合、次にステップＳ７が実施される。 In step S6, when it is determined that Tw1 <Two1, the temperature of the hot water flowing into the priority unit from the upstream is low, so the hot water supply operation by the priority unit is necessary. In this case, step S7 is performed next.
　ステップＳ７では、優先号機の給湯熱源ポンプ２４－ｎの運転が開始される。ステップＳ８では、後述する給湯開始タイマーによるカウントが開始される。ステップＳ８の次は、ステップＳ１１が実施される。 In step S7, operation of the hot water supply heat source pump 24-n of the priority unit is started. In step S8, counting by a hot water supply start timer described later is started. Following step S8, step S11 is performed.
　ステップＳ１１では、優先号機の給湯サーミスタ３５－ｎの検出温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たすか否かの判定が行われる。給湯サーミスタ３５－ｎの検出温度Ｔｋは、優先号機における給湯温度である。 In step S11, it is determined whether or not the detected temperature Tk of the hot water supply thermistor 35-n of the priority unit satisfies Tkmin ≦ Tk ≦ Tkmax. The detected temperature Tk of the hot water supply thermistor 35-n is the hot water supply temperature in the priority machine.
　ステップＳ１１において、給湯温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たさない場合、給湯温度の調整を行う必要がある。この場合、次にステップＳ１２が実施される。ステップＳ１２では、フィードバック制御等により給湯熱源ポンプ２４－ｎの回転数を変更することで、給湯温度ＴｋがＴｋｍｉｎ以上かつＴｋｍａｘ以下の範囲内に入るように調整される。ステップＳ１２の次は、ステップＳ１３が実施される。 In step S11, when the hot water supply temperature Tk does not satisfy Tkmin ≦ Tk ≦ Tkmax, it is necessary to adjust the hot water supply temperature. In this case, step S12 is performed next. In step S12, the hot water supply temperature Tk is adjusted to fall within the range of Tkmin or more and Tkmax or less by changing the rotation speed of the hot water supply heat source pump 24-n by feedback control or the like. Following step S12, step S13 is performed.
　ステップＳ１１において、給湯温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たす場合、給湯温度の調整を行う必要が無い。この場合、給湯熱源ポンプ２４－ｎの回転数が維持され、ステップＳ１３が実施される。 In step S11, when the hot water supply temperature Tk satisfies Tkmin ≦ Tk ≦ Tkmax, it is not necessary to adjust the hot water supply temperature. In this case, the rotation speed of the hot water supply heat source pump 24-n is maintained, and step S13 is performed.
　ステップＳ１３では、優先号機以外の各号機について、当該号機が優先号機よりも下流に位置しているか否かの判定が行われる。この判定は、予め制御部５０に保存された各貯湯式給湯機１０の号機番号に基づいて行われる。ステップＳ１３において、当該号機が優先号機よりも上流に位置していると判定された場合は、ステップＳ１４が実施される。ステップＳ１４では、当該号機の給湯運転が停止される。なお、既に当該号機の給湯運転が停止状態である場合、ステップＳ１４では、その状態が保持される。一方、ステップＳ１３において、当該号機が優先号機よりも下流に位置していると判定された場合は、ステップＳ１５が実施される。 In step S13, for each unit other than the priority unit, it is determined whether or not the unit is located downstream of the priority unit. This determination is performed based on the number of each hot water storage type hot water heater 10 stored in the control unit 50 in advance. If it is determined in step S13 that the relevant machine is located upstream of the priority machine, step S14 is performed. In step S14, the hot water supply operation of the relevant machine is stopped. In addition, when the hot water supply driving | operation of the said machine is already a stop state, the state is hold | maintained in step S14. On the other hand, if it is determined in step S13 that the relevant car is located downstream of the priority car, step S15 is performed.
　ステップＳ１５では、優先号機よりも下流に位置する号機の給水サーミスタ３３の検出温度Ｔｗ１が第２の給水温度判定値Ｔｗｏ２よりも低いか否かの判定が行われる。当該給水サーミスタ３３の検出温度Ｔｗ１は、当該号機における給水温度である。第２の給水温度判定値Ｔｗｏ２は、優先号機よりも下流に位置する号機の給湯熱源ポンプ２４の運転を開始させるか否かを判定するための温度閾値である。第２の給水温度判定値Ｔｗｏ２は、第１の給水温度判定値Ｔｗｏ１よりも大きい。第２の給水温度判定値Ｔｗｏ２は、目標給湯温度Ｔｋｔの下限値Ｔｋｍｉｎと第１の給水温度判定値Ｔｗｏ１との間の範囲に位置する温度に設定されればよい。第２の給水温度判定値Ｔｗｏ２は、例えば、使用者の求めに応じてリモコン３から設置値を変更可能であってもよい。 In step S15, it is determined whether or not the detected temperature Tw1 of the water supply thermistor 33 of the unit located downstream from the priority unit is lower than the second water supply temperature determination value Two2. The detected temperature Tw1 of the feed water thermistor 33 is the feed water temperature in the relevant unit. The second feed water temperature determination value Two2 is a temperature threshold value for determining whether or not to start the operation of the hot water supply heat source pump 24 of the number machine located downstream from the priority number machine. The second water supply temperature determination value Two2 is larger than the first water supply temperature determination value Two1. Second water supply temperature determination value Two2 may be set to a temperature located in a range between lower limit value Tkmin of target hot water supply temperature Tkt and first water supply temperature determination value Two1. For example, the second supply water temperature determination value Two2 may be changeable from the remote controller 3 according to the user's request.
　ステップＳ１５において、Ｔｗ１≧Ｔｗｏ２と判定された場合、優先号機の給湯運転により十分な給湯温度Ｔｋが確保できているため、優先号機よりも下流に位置する号機の給湯運転は不要である。この場合、次にステップＳ１７が実施される。ステップＳ１７では、優先号機の下流に位置する当該号機の給湯運転が停止される。なお、既に当該号機の給湯運転が停止状態である場合、ステップＳ１７では、その状態が保持される。 When it is determined in step S15 that Tw1 ≧ Two2, since a sufficient hot water supply temperature Tk can be secured by the hot water supply operation of the priority number machine, the hot water supply operation of the number machine located downstream from the priority number machine is unnecessary. In this case, step S17 is performed next. In step S17, the hot water supply operation of the relevant number machine located downstream of the priority number machine is stopped. In addition, when the hot water supply operation of the relevant machine is already stopped, the state is maintained in step S17.
　ステップＳ１５において、Ｔｗ１＜Ｔｗｏ２と判定された場合、優先号機の給湯運転では十分な給湯温度Ｔｋが確保されていないため、優先号機よりも下流に位置する号機の給湯運転が必要である。この場合、次にステップＳ１６が実施される。 If it is determined in step S15 that Tw1 <Two2, the hot water supply operation of the priority number machine does not ensure a sufficient hot water supply temperature Tk, and therefore the hot water supply operation of the number machine located downstream from the priority number machine is necessary. In this case, step S16 is performed next.
　ステップＳ１６では、ステップＳ８でカウントを開始した給湯開始タイマーの計測値Ｓｋが設定値Ｓｏ以上であるか否かの判定が行われる。給湯開始タイマーの設定値Ｓｏは、ステップＳ７における優先号機の給湯運転の開始から一定時間が経過するまでは優先号機の下流に位置する号機の給湯運転を開始しないために設けられる。例えば、前回の給湯から長時間経過すると、最上流に位置する１号機から給湯端末４までの給湯配管３４内に残留する湯水の温度は、外気温に近い程度まで低下している。このような状態で使用者が給湯端末４を開くと、直列に連結された各号機に低温の湯水が流入することになる。給湯端末４が開いた直後から各号機の給湯運転を開始する仕様のシステムでは、配管に残留する湯水の温度が低下している場合に、優先号機とその下流に位置する全ての号機が同時に給湯運転を開始することになる。この場合、各号機の貯湯タンク１１に貯留されている熱エネルギーを不必要に消費することに繋がる。このような事象を抑制するため、実施の形態１における貯湯式給湯システムでは、優先号機の給湯運転が開始されてから一定時間が経過するまで、優先号機よりも下流に位置する号機の給湯運転を行わない。これにより、優先号機から給湯端末４までの給湯配管３４内に存在する残水が排出されてから、優先号機よりも下流に位置する号機の給湯運転の開始可否が判定される。 In step S16, it is determined whether or not the measured value Sk of the hot water supply start timer that has started counting in step S8 is equal to or greater than the set value So. The set value So of the hot water supply start timer is provided in order not to start the hot water supply operation of the number machine located downstream of the priority number machine until a predetermined time has elapsed since the start of the hot water supply operation of the priority number machine in step S7. For example, when a long time has passed since the previous hot water supply, the temperature of the hot water remaining in the hot water supply pipe 34 from the No. 1 machine located on the most upstream side to the hot water supply terminal 4 has decreased to a level close to the outside air temperature. When the user opens the hot water supply terminal 4 in such a state, low-temperature hot water flows into the units connected in series. In the system of the specification that starts the hot water supply operation of each unit immediately after the hot water supply terminal 4 is opened, when the temperature of the hot water remaining in the pipe is lowered, the priority unit and all the units located downstream thereof are simultaneously supplied with hot water. Driving will start. In this case, it leads to unnecessarily consuming the thermal energy stored in the hot water storage tank 11 of each unit. In order to suppress such an event, in the hot water storage type hot water supply system in the first embodiment, the hot water supply operation of the number machine located downstream from the priority number machine is performed until a certain time has elapsed after the hot water supply operation of the priority number machine is started. Not performed. Thereby, after the residual water which exists in the hot water supply pipe 34 from a priority number machine to the hot water supply terminal 4 is discharged | emitted, it is determined whether the hot water supply driving | operation start of the number machine located downstream from a priority number machine is possible.
　なお、給湯開始タイマーの設定値Ｓｏは、例えば、予め使用者がシステムの給湯配管長および給湯瞬間流量などに基づいてリモコン３から設定することができる。給湯開始タイマーの設定値Ｓｏは、いずれか１台のリモコン３で設定されれば、全号機の制御部５０で共有される。 It should be noted that the set value So of the hot water supply start timer can be set in advance by the user from the remote controller 3 based on the length of the hot water supply pipe of the system and the instantaneous flow rate of hot water supply, for example. If the set value So of the hot water supply start timer is set by any one remote controller 3, it is shared by the control units 50 of all the cars.
　ステップＳ１６において、Ｓｋ＜Ｓｏと判定された場合は、優先号機の給湯運転の開始から十分な時間が経過していない。この場合、次にステップＳ１７が実施される。 In Step S16, when it is determined that Sk <So, sufficient time has not elapsed since the start of the hot water supply operation of the priority unit. In this case, step S17 is performed next.
　ステップＳ１６において、Ｓｋ≧Ｓｏと判定された場合は、優先号機の給湯運転の開始から十分な時間が経過している。この場合、次にステップＳ１８が実施される。 In Step S16, when it is determined that Sk ≧ So, a sufficient time has elapsed since the start of the hot water supply operation of the priority unit. In this case, step S18 is performed next.
　ステップＳ１８では、優先号機よりも下流に位置する号機それぞれの給湯サーミスタ３５の検出温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たすか否かの判定が行われる。ステップＳ１８において、優先号機よりも下流に位置する号機における給湯温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たす場合、当該号機による給湯温度の調整を行う必要が無い。この場合、次にステップＳ１９が実施される。ステップＳ１９では、その時点での当該号機の給湯運転の状態が保持される。 In step S18, it is determined whether or not the detected temperature Tk of the hot water supply thermistor 35 of each of the units located downstream of the priority unit satisfies Tkmin ≦ Tk ≦ Tkmax. In step S18, when the hot water supply temperature Tk in the unit located downstream from the priority unit satisfies Tkmin ≦ Tk ≦ Tkmax, it is not necessary to adjust the hot water supply temperature by the unit. In this case, step S19 is performed next. In step S19, the state of the hot water supply operation of the relevant machine at that time is maintained.
　ステップＳ１８において、優先号機よりも下流に位置する号機における給湯温度ＴｋがＴｋｍｉｎ≦Ｔｋ≦Ｔｋｍａｘを満たさない場合、当該号機による給湯温度の調整を行う必要がある。この場合、次にステップＳ２０が実施される。ステップＳ２０では、当該号機の給湯熱源ポンプ２４の運転が開始される。ステップＳ２０の次は、ステップＳ２１が実施される。ステップＳ２１では、フィードバック制御等により当該号機の給湯熱源ポンプ２４の回転数を変更することで、当該号機における給湯温度ＴｋがＴｋｍｉｎ以上かつＴｋｍａｘ以下の範囲内に入るように調整される。 In step S18, when the hot water supply temperature Tk in the unit located downstream from the priority unit does not satisfy Tkmin ≦ Tk ≦ Tkmax, it is necessary to adjust the hot water supply temperature by the unit. In this case, step S20 is performed next. In step S20, the operation of the hot water supply heat source pump 24 of the relevant unit is started. Following step S20, step S21 is performed. In step S21, the hot water supply temperature Tk in the relevant machine is adjusted to fall within the range of Tkmin or more and Tkmax or less by changing the rotation speed of the hot water supply heat source pump 24 of the relevant equipment by feedback control or the like.
　以上で説明した実施の形態１によれば、隣接する２つの貯湯式給湯機１０のうち上流側の貯湯式給湯機１０の給湯配管３４は、下流側の貯湯式給湯機１０の給水配管３１に接続される。制御部５０は、給湯運転中に給水サーミスタ３３で検出された給水温度が温度閾値以上である場合には、給湯熱源ポンプ２４の運転を停止させる。このため、不必要な給湯運転が行われることを防止できる。その結果、省エネ性を損なうことなく、直列に連結された複数の貯湯式給湯機１０で水源から給湯端末４へ至る湯水の経路を形成することができる。 According to the first embodiment described above, the hot water supply pipe 34 of the upstream hot water storage type hot water heater 10 among the two adjacent hot water storage type hot water heaters 10 is connected to the water supply pipe 31 of the downstream hot water storage type hot water heater 10. Connected. The control unit 50 stops the operation of the hot water supply heat source pump 24 when the water supply temperature detected by the water supply thermistor 33 during the hot water supply operation is equal to or higher than the temperature threshold. For this reason, unnecessary hot water supply operation can be prevented. As a result, a hot water path from the water source to the hot water supply terminal 4 can be formed by the plurality of hot water storage type hot water heaters 10 connected in series without impairing energy saving performance.
　また、複数の貯湯式給湯機１０のそれぞれが備える制御部５０は、互いに通信線で接続され、互いの運転状態および設定値を認識し、複数の貯湯式給湯機１０に優先順位を設定する機能を有する。現在の優先順位が最も高い貯湯式給湯機１０の制御部５０は、当該貯湯式給湯機１０の給水サーミスタ３３で検出された給水温度が温度閾値を下回った場合に、当該貯湯式給湯機１０の給湯熱源ポンプ２４の運転を開始させる。このため、上流から優先号機に流入する湯水の温度が低い場合に、優先号機の給湯運転を開始することができる。 Moreover, the control part 50 with which each of the several hot water storage type hot water heater 10 is mutually connected with a communication line, recognizes each other's operation state and setting value, and sets the priority order to the multiple hot water storage type hot water heaters 10. Have The control unit 50 of the hot water storage type hot water heater 10 having the highest current priority is configured so that the hot water supply type hot water heater 10 has a hot water temperature detected by the water supply thermistor 33 of the hot water storage type hot water heater 10 that is below the temperature threshold. The operation of the hot water supply heat source pump 24 is started. For this reason, when the temperature of the hot water flowing into the priority number machine from the upstream is low, the hot water supply operation of the priority number machine can be started.
　また、優先順位が最も高い貯湯式給湯機１０の制御部５０は、給水サーミスタ３３で検出された給水温度と比較する温度閾値として、他の貯湯式給湯機１０とは異なる値を使用する。具体的には、第１の給水温度判定値Ｔｗｏ１および第２の給水温度判定値Ｔｗｏ２は、個別に設定される。このため、優先号機の給湯運転で湯水が十分に加熱されなかった場合であっても、優先号機よりも下流に位置する号機の給湯運転によって加熱不足を補うことができる。 Further, the control unit 50 of the hot water storage hot water heater 10 having the highest priority uses a value different from that of the other hot water storage hot water heaters 10 as a temperature threshold value to be compared with the water supply temperature detected by the water supply thermistor 33. Specifically, the first water supply temperature determination value Two1 and the second water supply temperature determination value Two2 are individually set. For this reason, even if hot water is not sufficiently heated in the hot water supply operation of the priority number machine, the lack of heating can be compensated by the hot water supply operation of the number machine located downstream from the priority number machine.
　また、優先順位が最も高い貯湯式給湯機１０よりも上流に位置する貯湯式給湯機１０の制御部５０は、当該貯湯式給湯機１０の給湯運転を停止させる。このため、不必要な給湯運転が行われることを防止できる。 In addition, the control unit 50 of the hot water storage hot water heater 10 positioned upstream of the hot water storage hot water heater 10 having the highest priority stops the hot water supply operation of the hot water storage hot water heater 10. For this reason, unnecessary hot water supply operation can be prevented.
　また、優先順位が最も高い貯湯式給湯機１０の制御部５０は、当該貯湯式給湯機１０の貯湯タンク１１に貯留された湯水の温度が温度閾値を下回った場合に、当該貯湯式給湯機１０の給湯運転を停止させるとともに、優先順位が２番目に高い貯湯式給湯機１０の給湯運転を開始させる。このため、現在の優先号機では給湯運転に必要な残湯温度が不足している場合に、優先号機を再設定することができる。 Moreover, the control part 50 of the hot water storage type hot water heater 10 with the highest priority ranks the hot water storage type water heater 10 when the temperature of the hot water stored in the hot water storage tank 11 of the hot water storage type hot water heater 10 falls below the temperature threshold. The hot water supply operation of the hot water storage type water heater 10 having the second highest priority is started. For this reason, when the remaining hot water temperature required for the hot water supply operation is insufficient in the current priority unit, the priority unit can be reset.
　また、優先順位が最も高い貯湯式給湯機１０よりも下流に位置する貯湯式給湯機１０の制御部５０は、優先順位が最も高い貯湯式給湯機１０の給湯運転が開始されてから一定時間が経過するまでは給湯熱源ポンプ２４の運転を開始させない。具体的には、給湯開始タイマーの計測値Ｓｋが設定値Ｓｏ以上となるまでは、優先号機よりも下流に位置する号機の給湯運転が開始されない。このため、優先号機よりも下流に位置する号機に貯留されている熱エネルギーを不必要に消費することを防止できる。 In addition, the control unit 50 of the hot water storage hot water heater 10 located downstream of the hot water storage hot water heater 10 having the highest priority has a certain time after the hot water supply operation of the hot water storage hot water heater 10 having the highest priority is started. The operation of the hot water supply heat source pump 24 is not started until the time has elapsed. Specifically, the hot water supply operation of the number machine located downstream from the priority number machine is not started until the measured value Sk of the hot water supply start timer becomes equal to or greater than the set value So. For this reason, it can prevent unnecessarily consuming the heat energy stored in the number machine located downstream from the priority number machine.
　また、優先順位が最も高い貯湯式給湯機１０の給湯運転が開始されてから他の貯湯式給湯機１０の給湯熱源ポンプ２４の運転が開始されるまでの一定時間は、使用者の求めに応じて変更可能である。このため、貯湯式給湯システムの規模などに応じて給湯開始タイマーの設定値Ｓｏを適切に設定できる。 Further, a certain period of time from the start of the hot water supply operation of the hot water storage type hot water heater 10 having the highest priority to the start of the operation of the hot water supply heat source pump 24 of the other hot water storage type hot water supply apparatus 10 depends on the user's request. Can be changed. For this reason, the set value So of the hot water supply start timer can be appropriately set according to the scale of the hot water storage type hot water supply system.
　また、優先順位が最も高い貯湯式給湯機１０の制御部５０は、当該貯湯式給湯機１０が湯切れするまで沸き上げ運転を停止させる。このため、現在の優先号機に貯留された熱エネルギーを無駄なく使用することができる。 Also, the control unit 50 of the hot water storage hot water heater 10 having the highest priority stops the boiling operation until the hot water storage hot water heater 10 runs out of hot water. For this reason, the thermal energy stored in the current priority machine can be used without waste.
　また、制御部５０は、貯湯タンク１１内に貯留されている熱エネルギー量が小さい貯湯式給湯機１０ほど優先順位が高くなるように複数の貯湯式給湯機１０に優先順位を設定する。このため、複数の貯湯式給湯機１０のそれぞれに貯留された熱エネルギーは、残存量の少ない順に消費される。その結果、複数の貯湯式給湯機１０の間で沸き上げ運転負荷に偏りが生じることを抑制できる。 In addition, the control unit 50 sets priorities for the plurality of hot water storage water heaters 10 so that the hot water storage water heaters 10 having a smaller amount of heat energy stored in the hot water storage tank 11 have higher priorities. For this reason, the thermal energy stored in each of the plurality of hot water storage type hot water heaters 10 is consumed in ascending order of the remaining amount. As a result, it is possible to suppress the occurrence of a bias in the boiling operation load among the plurality of hot water storage type hot water heaters 10.
　また、貯湯式給湯機１０の熱源は、ヒートポンプでなくともよい。貯湯式給湯機１０は、例えば、貯湯タンク１１内に電熱ヒーターなどが熱源として設けられたものでもよい。この場合も、貯湯式給湯システムにおいて省エネ性を損なうことを防止できる。 Further, the heat source of the hot water storage type water heater 10 may not be a heat pump. The hot water storage type water heater 10 may be, for example, an electric heater provided in the hot water storage tank 11 as a heat source. Also in this case, it is possible to prevent the energy saving performance from being impaired in the hot water storage type hot water supply system.
　この発明は、省エネ性を損なうことなく、直列に連結された複数の貯湯式給湯機で水源から給湯端末へ至る湯水の経路を形成するシステムに利用できる。 The present invention can be used in a system for forming a hot water path from a water source to a hot water supply terminal by using a plurality of hot water storage hot water heaters connected in series without impairing energy saving performance.
１　ヒートポンプユニット
２　タンクユニット
３　リモコン
４　給湯端末
１０　貯湯式給湯機
１１　貯湯タンク
１２　ＨＰ往き配管
１３　ＨＰ戻り配管
１４　沸上循環ポンプ
１５　上部残湯サーミスタ
１６　下部残湯サーミスタ
１７　中部残湯サーミスタ
２１　給湯用熱交換器
２２　熱源導入配管
２３　熱源導出配管
２４　給湯熱源ポンプ
３１　給水配管
３２　給湯流量センサ
３３　給水サーミスタ
３４　給湯配管
３５　給湯サーミスタ
５０　制御部 DESCRIPTION OF SYMBOLS 1 Heat pump unit 2 Tank unit 3 Remote control 4 Hot-water supply terminal 10 Hot water storage-type water heater 11 Hot water storage tank 12 HP outgoing piping 13 HP return piping 14 Boiling circulation pump 15 Upper residual hot water thermistor 16 Lower residual hot water thermistor 17 Central residual hot water thermistor 21 Heat exchanger 22 Heat source introduction pipe 23 Heat source outlet pipe 24 Hot water supply heat source pump 31 Hot water supply pipe 32 Hot water supply flow rate sensor 33 Hot water supply thermistor 34 Hot water supply pipe 35 Hot water supply thermistor 50 Controller

Claims (9)

  1. 　直列に連結された複数の貯湯式給湯機で水源から給湯端末へ至る湯水の経路を形成するシステムであって、
    　個々の貯湯式給湯機は、
    　熱源によって加熱される湯水を貯留する貯湯タンクと、
    　前記貯湯タンクから供給される湯水と水源から供給される湯水との間で熱交換を行わせる給湯用熱交換器と、
    　水源からの湯水を前記給湯用熱交換器に導く給水配管と、
    　前記給湯用熱交換器から給湯端末へ湯水を導く給湯配管と、
    　前記給水配管に設けられた給水サーミスタと、
    　前記貯湯タンクと前記給湯用熱交換器との間で湯水を循環させる給湯熱源ポンプと、
    　前記給湯熱源ポンプを制御する制御部と、
    を備え、
    　上流側の貯湯式給湯機の前記給湯配管は、下流側の貯湯式給湯機の前記給水配管に接続され、
    　前記制御部は、給湯運転中に前記給水サーミスタで検出された給水温度が温度閾値以上である場合には、前記給湯熱源ポンプの運転を停止させる貯湯式給湯システム。     A system for forming a hot water path from a water source to a hot water supply terminal with a plurality of hot water storage type hot water heaters connected in series,
    Individual hot water storage water heaters
    A hot water storage tank for storing hot water heated by a heat source;
    A hot water supply heat exchanger that exchanges heat between hot water supplied from the hot water storage tank and hot water supplied from a water source;
    A water supply pipe for leading hot water from a water source to the hot water supply heat exchanger;
    A hot water supply pipe for leading hot water from the heat exchanger for hot water supply to the hot water supply terminal;
    A water supply thermistor provided in the water supply pipe;
    A hot water supply heat source pump for circulating hot water between the hot water storage tank and the hot water supply heat exchanger;
    A control unit for controlling the hot water supply heat source pump;
    With
    The hot water supply pipe of the upstream hot water storage type water heater is connected to the water supply pipe of the downstream hot water storage type water heater,
    The control unit is a hot water storage type hot water supply system that stops the operation of the hot water supply heat source pump when a supply water temperature detected by the water supply thermistor during a hot water supply operation is equal to or higher than a temperature threshold.
  2. 　複数の貯湯式給湯機のそれぞれが備える前記制御部は、互いに通信線で接続され、互いの運転状態および設定値を認識し、複数の貯湯式給湯機に優先順位を設定する機能を有し、
    　優先順位が最も高い貯湯式給湯機の前記制御部は、前記給水サーミスタで検出された給水温度が温度閾値を下回った場合に前記給湯熱源ポンプの運転を開始させる請求項１に記載の貯湯式給湯システム。     The control unit provided in each of a plurality of hot water storage type hot water heaters are connected to each other via a communication line, have a function of recognizing each other's operation state and set value, and setting a priority order to the plurality of hot water storage type water heaters,
    2. The hot water storage hot water supply according to claim 1, wherein the control unit of the hot water storage type hot water heater having the highest priority starts operation of the hot water supply heat source pump when the temperature of the water supply detected by the water supply thermistor falls below a temperature threshold. system.
  3. 　優先順位が最も高い貯湯式給湯機の前記制御部は、前記給水サーミスタで検出された給水温度と比較する温度閾値として、他の貯湯式給湯機とは異なる値を使用する請求項２に記載の貯湯式給湯システム。 The said control part of the hot water storage type water heater with the highest priority uses the value different from other hot water storage type water heaters as a temperature threshold value compared with the water supply temperature detected by the said water supply thermistor. Hot water storage hot water system.
  4. 　優先順位が最も高い貯湯式給湯機よりも上流に位置する貯湯式給湯機の前記制御部は、当該貯湯式給湯機の給湯運転を停止させる請求項２または請求項３に記載の貯湯式給湯システム。 The hot water storage hot water supply system according to claim 2 or 3, wherein the control unit of the hot water storage hot water heater located upstream of the hot water storage hot water heater having the highest priority stops the hot water supply operation of the hot water storage hot water heater. .
  5. 　優先順位が最も高い貯湯式給湯機の前記制御部は、前記貯湯タンクに貯留された湯水の温度が温度閾値を下回った場合に、当該貯湯式給湯機の給湯運転を停止させるとともに、優先順位が２番目に高い貯湯式給湯機の給湯運転を開始させる請求項２から請求項４のいずれか１項に記載の貯湯式給湯システム。 When the temperature of the hot water stored in the hot water storage tank falls below the temperature threshold, the control unit of the hot water storage hot water heater having the highest priority stops the hot water supply operation of the hot water storage hot water heater, and the priority is The hot water storage hot water supply system according to any one of claims 2 to 4, wherein the hot water supply operation of the second highest hot water storage hot water heater is started.
  6. 　優先順位が最も高い貯湯式給湯機よりも下流に位置する貯湯式給湯機の前記制御部は、優先順位が最も高い貯湯式給湯機の給湯運転が開始されてから一定時間が経過するまでは前記給湯熱源ポンプの運転を開始させない請求項２から請求項５のいずれか１項に記載の貯湯式給湯システム。 The control unit of the hot water storage hot water heater located downstream from the hot water storage hot water heater having the highest priority is the above-mentioned until the predetermined time elapses after the hot water supply operation of the hot water storage hot water heater having the highest priority is started. The hot water storage hot water supply system according to any one of claims 2 to 5, wherein the operation of the hot water supply heat source pump is not started.
  7. 　優先順位が最も高い貯湯式給湯機の給湯運転が開始されてから他の貯湯式給湯機の前記給湯熱源ポンプの運転が開始されるまでの一定時間は、使用者の求めに応じて変更可能である請求項６に記載の貯湯式給湯システム。 The fixed time from the start of the hot water supply operation of the hot water storage type hot water heater having the highest priority to the start of the operation of the hot water supply heat source pump of the other hot water storage type water heater can be changed according to the user's request. The hot water storage type hot water supply system according to claim 6.
  8. 　優先順位が最も高い貯湯式給湯機の前記制御部は、当該貯湯式給湯機が湯切れするまで沸き上げ運転を停止させる請求項２から請求項７のいずれか１項に記載の貯湯式給湯システム。 The hot water storage hot water supply system according to any one of claims 2 to 7, wherein the control unit of the hot water storage hot water heater having the highest priority stops the boiling operation until the hot water storage hot water heater runs out of hot water. .
  9. 　前記制御部は、前記貯湯タンク内に貯留されている熱エネルギー量が小さい貯湯式給湯機ほど優先順位が高くなるように複数の貯湯式給湯機に優先順位を設定する請求項２から請求項８のいずれか１項に記載の貯湯式給湯システム。 The said control part sets a priority to several hot water storage type hot water heaters so that a priority becomes high so that a hot water storage type hot water heater with the small amount of thermal energy stored in the said hot water storage tank may be set. The hot water storage type hot water supply system according to any one of the above.
PCT/JP2018/017043 2018-04-26 2018-04-26 Hot water storage-type hot water supply system WO2019207725A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090816A (en) * 2003-09-16 2005-04-07 Matsushita Electric Ind Co Ltd Heat pump water heater
JP2015078811A (en) * 2013-10-18 2015-04-23 三菱電機株式会社 Hot water system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006118814A (en) * 2004-10-22 2006-05-11 Denso Corp Heat storage type water heater
JP5577135B2 (en) * 2010-04-01 2014-08-20 パーパス株式会社 Water heater
JP2013244121A (en) * 2012-05-24 2013-12-09 Mac:Kk Water supply and discharge device of boiling device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090816A (en) * 2003-09-16 2005-04-07 Matsushita Electric Ind Co Ltd Heat pump water heater
JP2015078811A (en) * 2013-10-18 2015-04-23 三菱電機株式会社 Hot water system

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